Merge pull request #25909 from gblikas:patch-1

Update intrin_wasm.hpp #25909

See https://github.com/microsoft/vcpkg/issues/33443 for some build context when using 

```vcpkg install opencv4:wasm32-emscripten```

`__EMSCRIPTEN_major__`, `__EMSCRIPTEN_minor__` and `__EMSCRIPTEN_tiny__` in `emsdk` >= 3.1.4 are in a header, as opposed to command line. 

We could potentially be more aggressive with how I'm checking this property; let me know if I should make the change. 

It should also be suggested that `-msimd128` is auto-included in the associated portfile for opencv, but that's a separate issue. Someone let me know if I should also make that change as well. 

Special thanks to https://github.com/youar for supporting this work; please inform if applying a copyright-header is appropriate attribution.

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

modules/core/include/opencv2/core/hal/intrin_wasm.hpp

@@ -8,9 +8,18 @@
 #include <limits>
 #include <cstring>
 #include <algorithm>
-#include <emscripten/version.h>
 #include "opencv2/core/saturate.hpp"
 
+
+// Emscripten v2.0.13 (latest officially supported, as of 07/30/2024):
+// __EMSCRIPTEN_major__, __EMSCRIPTEN_minor__ and __EMSCRIPTEN_tiny__ are defined via commandline in
+// https://github.com/emscripten-core/emscripten/blob/1690a5802cd1241adc9714fb7fa2f633d38860dc/tools/shared.py#L506-L515
+//
+// See https://github.com/opencv/opencv/pull/25909
+#ifndef __EMSCRIPTEN_major__
+#include <emscripten/version.h>
+#endif
+
 #define CV_SIMD128 1
 #define CV_SIMD128_64F 0 // Now all implementation of f64 use fallback, so disable it.
 #define CV_SIMD128_FP16 0

modules/js/perf/package.json

@@ -2,18 +2,18 @@
     "name": "opencv_js_perf",
     "description": "Perfermance tests for opencv js bindings",
     "version": "1.0.0",
-    "dependencies" : {
-      "benchmark" : "latest"
+    "dependencies": {
+        "benchmark": "latest"
     },
     "repository": {
-      "type": "git",
-      "url": "https://github.com/opencv/opencv.git"
+        "type": "git",
+        "url": "https://github.com/opencv/opencv.git"
     },
     "keywords": [],
     "author": "",
     "license": "Apache 2.0 License",
     "bugs": {
-      "url": "https://github.com/opencv/opencv/issues"
+        "url": "https://github.com/opencv/opencv/issues"
     },
     "homepage": "https://github.com/opencv/opencv"
-  }
+}